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Q. What is compound?
A compound is a substance which consists of two or more elements chemically combined. The elements in a compound aren't simply mingled together as they are in a mixture. In its place they are combined in a way such that the compound has properties that are different from those of the elements of which it is composed. Every compound is represented by a formula a combination of the symbols of the elements that make up the compounds. You may already recognize some chemical formulas such as H2O for water, NaCl for table salt and NH3 for ammonia.
Q. Define Taste sensitivity? The concentration of a substance (in saliva) required to trigger the sensation of taste is much higher than the concentration of a substance (in ai
Q. What is SI unit of energy? Ans. The SI unit of energy is called the joule. A joule is a pretty small mount of energy so often chemists will use the unit kJ =1 kilojoule
A mixture of air and methanol vapour is fed to a converter in which the following reactions take place: CH OH O HCHO H O 3 2 2 2 1 + ® + 3 2 CH OH ® HCHO + H In addit
Which of the following has the least energy: (1) 2p (2) 3p (3) 2s (4) 4d Ans: 2s
Q. How can we obtain Boron? Boron is- obtained by the red-action of B 2 O 3 with magnesium or sodium B 2 0 3 is first prepared by strongly katingH 3 B0 3 which is obtained b
How are the following sole produced (a) Sulphur sol (b) Collodion
Preparation of dimethylbutan: Procedure: Prepare a mixture of 3,3-dimethylbutan-2-one (trivial name pinacolone; 20.0 g, 0.200 moles), redistilled benzaldehyde (24.0 g,
In solid state chemistry the CN 2 2- ion shows constitutional isomerism. The free acids of both anions (at least in the gas phase) are known. Illustrate the structural formul
Laws of mass action were proposed by Gulberg and Waage. The rate of chemical reaction is directly proportional to the product of the active masses of the reactants (molar concentra
List three factor that affect conductivity
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